1. Incorporation of Carbon Footprint Estimates into Remedial Alternatives Evaluations Christopher Glenn, P.E., LEED GA, Treadwell & Rollo Lowell Kessel, P.G., R.E.A., EnviroLogek Wednesday, June 16, 2010 Green Remediation Conference Amherst, Massachusetts

11. Carbon Footprint Assessment Basis for Calculation 14% 2.77 x10 -5 2.06 x 10 -5 to 2.77 x10 -5 pounds per lb-mile CO2 per Train lb-mile N/A 6.4 N/A miles per gallon Full-Sized Truck Fuel Efficiency N/A 7.9 N/A miles per gallon Mid-Sized Truck Fuel Efficiency N/A 17.6 N/A miles per gallon Personal Vehicle Fuel Efficiency +/- Range Value Range of Values Units

12. Carbon Footprint Assessment Basis for Calculation 46% 0.915 0.524 to 1.34 CO2 eq per kWh CO2 equiv per kWh of electricity N/A 2 N/A gallons per hour Forklift Fuel Consumption N/A 6 N/A gallons per hour Trencher Fuel Consumption 41% 5.1 3.0 to 7.2 gallons per hour Drill Rig Fuel Consumption (HSA) 58% 1.9 0.8 to 3.0 gallons per hour Drill Rig Fuel Consumption (Direct Push) +/- Range Value Range of Values Units

13. Carbon Footprint Assessment Basis for Calculation 17% 2.31 1.91 to 2.71 CO2 eq per pound CO2 per pound of GAC produced 9% 0.915 0.83 to 1.0 CO2 eq per pound CO2 per pound of Grout produced N/A 0.005 N/A CO2 eq per pound CO2 per pound of Sand produced 79% 1.565 0.33 to 2.8 CO2 eq per pound CO2 per pound of Edible Oil produced 4% 2.834 2.72 to 2.95 CO2 eq per pound CO2 per pound of Steel produced 16% 2.162 1.824 to 2.50 CO2 eq per pound CO2 per pound of PVC produced +/- Range Value Used Range of Values Units